<!DOCTYPE html>
<html lang="en">
  <head>
    <title></title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
      .test {
        width: 0;
        height: 0;
        border: 100px solid  grey;
        border-left-color: #FF4F53;
        border-right-color: yellow;
      }
    </style>
  </head>
  <body>
    <div class="test">

    </div>
  </body>
</html>
